This episode balances three plotlines. In the main story, Captain Archer investigates the appearance of an alien pilot (Thomas Kopache) at the site of a spatial anomaly. Unknown to the crew, this alien is one of the Sphere Builders who will become prominent in later episodes. In a secondary story, the long-simmering anger between Lt. Malcolm Reed and Major Hayes finally comes to a head when they get into a physical fight over their competing roles aboard Enterprise. Lastly, Sub-commander T'Pol experiences unexpected jealousy when Commander Tucker begins displaying an attraction to a female MACO, which leads to an emotional confrontation with results that leave both parties surprised and uncomfortable.